"The battle with the slum" is properly the sequel to "How the other half lives". Based upon the author's earlier work, A ten years' war, "retaining all that still applied of the old volume" with the addition of much new matter. cf. Pref
Evidence reported by alyson-wieczorek for item battlewithslum00riisiala on August 28, 2007: visible notice of copyright; stated date is 1902.